1. Section of Endocrinology and Metabolism, Department of Medicine, Tulane University Health Sciences Center, New Orleans, LA
2. Institute of Metabolism and Systems Research, University of Birmingham, Birmingham, U.K.
3. Department of Clinical Biochemistry, Wythenshawe Hospital, Manchester University NHS Foundation Trust, Manchester, U.K.
4. National Institute for Health Research Birmingham Biomedical Research Centre, University of Birmingham and University Hospitals Birmingham NHS Foundation Trust, Birmingham, U.K.
5. Southeast Louisiana Veterans Health Care System, New Orleans, LA